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Find The Derivative Of The Cosine Function

If f(x)=cos7x. Calculate d/dx [f(x)]   

If f(x) =3+cosx. Calculate d/dx [f(x)]    

 If f(x)=sin x ex. Calculate d/dx [f(x)]   

 If g(x) = cos x. Calculate d/dx [g(x)]  

  If f(x)=cos 7x. Calculate d/dx[f(x)] 

 If f(x)= cos2x. Calculate d/dx [f(x)]  

If f(x)=cosx lnx. Calculate d/dx [f(x)]

If g(x)=4+cos x2.Calculate d/dx [g(x)]   

If f(x)=-cos (x+1).  Calculate d/dx [f(x)]            

 If f(x)=-8cosx.  Calculate d/dx[f(x)]